三相五柱变压器不同性质负载时直流偏磁电磁特性分析  

Analysis of DC Bias Electromagnetic Characteristics of Three-phase Five-limb Transformers with Different Properties of Load

作　　者：李宇妍 段延达 邹坤 袁程浩 李天宇 LI Yuyan;DUAN Yanda;ZOU Kun;YUAN Chenghao;LI Tianyu(State Grid Jibei Electric Power Co.,Ltd.Engineering Management Branch,Beijing 100070,China;State Grid Beijing Haidian Power Supply Company,Beijing 100195,China)

机构地区：[1]国网冀北电力有限公司工程管理分公司,北京100070 [2]国网北京海淀供电公司,北京100195

出　　处：《电工技术》2024年第21期85-87,91,共4页Electric Engineering

摘　　要：三相五柱变压器广泛应用于我国配电网中,为供电所的重要设备。随着特高压技术的不断发展,近年来直流偏磁现象出现得愈来愈频繁。直流偏磁现象对变压器的危害极其严重,其中包括铁心饱和、损耗增加、温升振动等,均影响变压器正常运行,严重情况下甚至可能影响电网稳定,故有必要对直流偏磁现象进行研究。建立三相五柱变压器三维有限元场路耦合计算模型,以分析负载侧带有不同性质负载发生直流偏磁时电流畸变的方式,并分析物理原因。Three-phase five-limb transformers are widely used in China′s distributing networks and are important equipment in supply stations.With the continuous development of ultra-high voltage technology,the phenomenon of DC bias has become increasingly frequent in recent years.DC bias is extremely harmful to transformers,including core saturation,increased losses,temperature rise vibration,all of which affect the normal operation of transformers.In severe cases,it may even affect the stability of power grid.Therefore this paper establishes a three-dimensional finite element field circuit coupling calculation model for three-phase five-limb transformers to analyze the current distortion mode and physical reasons when DC bias occurs on the load side with different properties of loads.

关 键 词：三相五柱变压器 直流偏磁 场路耦合模型 励磁电流 

分 类 号：TM41[电气工程—电器]